Recommendation : Approx 30 gr on 40cm x 50cm size of surface.
The main criteria is that you want to lay down as much white ink as possible on the first pass as the underbase on polyester garments. You will need to apply more ink than on a 100% cotton shirt. How much white ink you can lay down in a single pass will be dependent on your printer and your RIP. Some printers, like the Epson default settings will not allow as much ink s is required. You will have to do your testing with the type of printer you have and your type of polyester tshirt.
Working in conjunction with the amount of ink the printer can physically lay down is the RIP. The RIP will also limit how much ink you can put on. Polyester will require 1.5-3 times the white ink to achieve a great looking finished product when compared with a 100% cotton shirt. Testing with your own equipment and settings will be required. Laying down too much white ink can result in the white ink not being kicked over” enough and then when the CMYK is applied it will look great on the printer platen, but when you heat press the ink it will blend into the white causing a dulling and image clarity degradation. So, finding the optimal amount of white ink for your printer will take some testing with your printer and RIP.
1. If the fabric is a blended with poly....poly doesn't absorb the pre-treat liquids and this causes the print to feel sticky.
2. If the pre-treat liquids are sprayed more than the fabric can absorb, the liquids remain on the surface and this causes stickiness. Please try to spray a lesser amount.
3. If you feel this stickiness the active ingredients are not fully cured by the heat and you will need to press with higher temperature or for a longer time.